Electric switch for elevators.



Patented Sept. 14, 1915.

2 SHEETSSHEET I.

F. N. WAKE.

ELECTRIC SWITCH FOR ELEVATORS.

APPLICATION FILED AUG.2I. 191.4.

WITNESSES:

F. N. WAKE.

ELECTRIC SWITCH FOR ELEVATORS.

' APPLICATION FILED AUG.2I, 1914. 1,153,656.

Patented Sept. 14, 1915.

2 SHEETSSHEET 2.

INVENTOI'? PALM Nwm flaf WITNESSES i; e JQwfzfi FREDERICK 1\T. WAKE; OF NEW YORK, N. Y., ASSIGNOR 'I'O HIMSELF, STERET'E R. PREVOST, J; MAXWELL .COOTE, AND EDWARD F. FISHER, TRADING UNDER THE NAME OF THE SPECIALTY DEVELOPMEIMILQQ, 0F NEW YORK, N. Y.

ELECTRIC SWITCH FOR ELEVATORS.

Specification of Letters Patent.

Patented Sept. 3141, i915.

Application filed August 21,.1914. Serial No. 857,864.

To all whom it may concern: I

Be it known that I, FREDERICK N. WAKE, a citizen of the United States, residing in the borough of the Bronx, city of New York, county of Bronx, State of New York, have invented a certain new and useful Improvement in Electric Switches for Elevators, of which the following is a specification.

This invention relates generally to electric switches, with particular reference to the application. of suchswitches tosafety devices such as are applied'to the doors of elevator shafts and the like.

The object of the invention is to provide a switch equipped with rubbing contacts to make it certain in its operation, and further to provide a switch that will indicate automatically that it is out of order should it become broken or disabled.

Referring to the drawings: Figure 1 1s *a sideelevation of the switch; Fig. 2 is a sections 1.2 and 13 electrically separatedfrom each other by insulation 14, but with the two extremities in contact through a shaft 15 carrying a friction roller 16. Section 12 of the arm is pivoted upon the shaft 11 and has an extension hub 17 within whicha spring 18 engaging the shaft 11 and section 12 is located, the spring operating to throw the arm downward from the position shown in Fig. 3.

The extension hub 17 carries a cylindrical member of suitable insulating material 19 upon which is mounted as shown in Fig. 4, a segment 20, 111 electric connection with thehub 17 by means of the screw 21. Section 13 of the arm is rigidly fastened to section 12, and, as shown in Fig. 2, is clear from contact with the shaft 11 and is insulated from the casing cover 22 at 23. A second segment 2-1 mounted upon the member 19 is mechanically and electrically connected with to a safety device for elevator shafts.

section 13 as shown in Fig. 3.. Two brushes 25, 25 bearing upon the segments and member 19 are mounted in insulating blocks 26, 26 and are maintained in contact with the member 19 and segments by springs 27, 27. To the brushes are attached respectively the conductors 28, 29.

A. block of insulation 30 is'attached to the casing 10 to prevent the arm from contacting with the casing. The shaft ll is provided with a boss 31 which is adapted to form a bearing for the hub 17.

In operation, the circuit is normally closed at the switch with the arm depressed from the position shown in Fig. 3. The elevation of the switch arm, however, as shown in the figure, will move the segments 20" and '24: out of contact with the brushes 25, 25, opening a circuit that includes the two sections 12 and 13 of the switch arm and the friction roller shaft 15.

It will be seen that if for any reason the switch arm should become broken the circuit will be opened and the system will remain inoperative until the broken switch arm is located and repaired.

Fig. 5 shows an application of the switch this figure the switch is shown at 35, the arm at 36, the door 37, circuit 38, 39, and a suitable safety device is indicated at 40. As shown, the opening and closing of the door operates the switch in the manner described;

It is obvious that the switch may also be used in open circuit systems as well with the closed circuit shown. In such cases, the switch is preferably provided with a spring acting in the opposite direction to the one shown.

I claim: 1. In combination, an electric switch and an arm for operating the switch", the arm 4 bifurcated arm for operating the switch,

and connections between the arm and switch whereby the current flows through the arm when the circuit is made.

3. In combination, an oscillating electric switch, an oscillating bifurcated arm for operating the switch, and connections between the arm and the switch whereby the arm forms a part of the circuit when the circuit is made by the switch.

4. A switch having in combination oscillating contact segments, brushes adapted to bear upon the segments, ,and a bifurcated other, and at their inner ends in connection each with a segment, whereby when the circuit ismade by the switch it includes the sections of the said arm.

5. A door-operated electric switch having an arm, controlled by the movement of the door, for operating the switch, the arm having a'sectional construction, the sections being a part of the circuit made and broken by the switch.

6. A door-operated electric switch having a bifurcated arm, controlled by'themovement of the door, for operating the switch, and connections between the arm and switch whereby the current flows through the arm when'the circuit is. madeby the switch.

7 A dooroperated oscillating electric switch having an oscillating bifurcated arm controlled by the movement of the door for operating the switch, and connections between the arm and the switch whereby the arm forms a part of the circuit when the circuit is made by the switch.

8. A door-operated electric switch having a bifurcated arm controlled by the movement of the door for operating the switch, the said switch having in combination oscillating contact segments, brushes adapted to bear upon the segments, the segments being oscillated by the said arm, the sections of the arm at their outer extremities being in electrical connection with each other, and

at their inner ends in connection each with .a segment, whereby when the circuit is made 

